Single-step chemical vapour deposition of anti-pyramid MoS2/WS2 vertical heterostructures.
Xueyin Bai,Shisheng Li,Susobhan Das,Luojun Du,Yunyun Dai,Lide Yao,Ramesh Raju,Mingde Du,Harri Lipsanen,Zhipei Sun +9 more
TLDR
In this paper, a single-step chemical vapour deposition (CVD) process was used to synthesize an anti-pyramid MoS2/WS2 structure, which is characterized by Raman, photoluminescence and second harmonic generation microscopy.Abstract:
Van der Waals heterostructures are the fundamental building blocks of electronic and optoelectronic devices Here we report that, through a single-step chemical vapour deposition (CVD) process, high-quality vertical bilayer MoS2/WS2 heterostructures with a grain size up to ∼60 μm can be synthesized from molten salt precursors, Na2MoO4 and Na2WO4 Instead of normal pyramid vertical heterostructures grown by CVD, this method synthesizes an anti-pyramid MoS2/WS2 structure, which is characterized by Raman, photoluminescence and second harmonic generation microscopy Our facile CVD strategy for synthesizing anti-pyramid structures unveils a new synthesis route for the products of two-dimensional heterostructures and their devices for applicationread more
Citations
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Switchable Photoresponse Mechanisms Implemented in Single van der Waals Semiconductor/Metal Heterostructure
Mingde Du,Dirk Dressler +1 more
TL;DR: In this paper , the authors investigate the vdW semiconductor/metal heterostructure built with 2D semiconducting InSe and metallic 1T-phase NbTe2, whose electron affinity χInSe and work function ΦNbTe 2 almost exactly align.
Journal ArticleDOI
Enhancing Si3N4 Waveguide Nonlinearity with Heterogeneous Integration of Few-Layer WS2.
Yuchen Wang,Vincent Pelgrin,Vincent Pelgrin,Samuel Gyger,Gius Uddin,Xueyin Bai,Christian Lafforgue,Laurent Vivien,Klaus D. Jöns,Eric Cassan,Zhipei Sun +10 more
TL;DR: In this article, a few-layer WS2 flake of ∼14.8 μm length was transferred to a dispersion-engineered silicon nitride waveguide and an effective nonlinear coefficient higher than 600 m-1 W-1 was retrieved for the heterogeneous waveguide indicating an enhancement factor of larger than 300 with respect to the pristine waveguide at a wavelength of 800 nm.
Journal ArticleDOI
Salt-assisted chemical vapor deposition of two-dimensional transition metal dichalcogenides.
TL;DR: In this article, the distinct functions of halogens (F, Cl, Br, I) and alkali metals (Li, Na, K) in SA-CVD are first clarified.
Journal ArticleDOI
Molybdenum Disulfide/Double‐Wall Carbon Nanotube Mixed‐Dimensional Heterostructures
Xueyin Bai,Zhenyu Xu,Qiang Zhang,Shisheng Li,Yunyun Dai,Xiaoqi Cui,Hoon Hahn Yoon,Lide Yao,Hua Jiang,Mingde Du,Yi Zhang,Esko I. Kauppinen,Zhipei Sun +12 more
TL;DR: In this article, a direct synthesis method of molybdenum disulfide/double-wall carbon nanotube (MoS2/DWCNT) mixed-dimensional heterostructures by sulfurating a molten salt, Na2MoO4, on a substrate covered with a DWCNT film is reported.
References
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2D materials and van der Waals heterostructures
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Vertical and in-plane heterostructures from WS2/MoS2 monolayers.
Yongji Gong,Junhao Lin,Xingli Wang,Gang Shi,Sidong Lei,Zhong Lin,Xiaolong Zou,Gonglan Ye,Robert Vajtai,Boris I. Yakobson,Humberto Terrones,Mauricio Terrones,Beng Kang Tay,Jun Lou,Sokrates T. Pantelides,Zheng Liu,Wu Zhou,Pulickel M. Ajayan +17 more
TL;DR: A one-step growth strategy for the creation of high-quality vertically stacked as well as in-plane interconnected heterostructures of WS2/MoS2 via control of the growth temperature is reported.
Journal ArticleDOI
Light-emitting diodes by band-structure engineering in van der Waals heterostructures
Freddie Withers,O. Del Pozo-Zamudio,Artem Mishchenko,A. P. Rooney,Ali Gholinia,Kenji Watanabe,T. Taniguchi,Sarah J. Haigh,Andre K. Geim,Alexander I. Tartakovskii,Kostya S. Novoselov +10 more
TL;DR: In this paper, the authors describe light-emitting diodes (LEDs) made by stacking metallic graphene, insulating hexagonal boron nitride and various semiconducting monolayers into complex but carefully designed sequences.